Uzbek foreign affairs minister Abdulaziz Kamilov said the 39-year-old father-of-four had been recruited by the terrorist group while in Sweden, where he had lived since 2014.
The UzDaily news portal reported that Mr Kamilov had said that information on the suspect was given "to one of our Western partners" for transmission to Sweden.
The portal did not say when the information was sent.
Reports this week said Uzbekistan had opened a criminal case against Akilov for extremist connections.
Four people, including Briton Chris Bevington, 41, were killed when the suspect allegedly ploughed into a shopping centre in the Swedish capital last Friday
A 31-year-old Belgian woman, a 69-year-old Swedish woman and an 11-year-old Swedish girl also died.
Some 15 people were injured.